The concentration of a certain sodium hydroxide solution was determined by using the solution to titrate a sample of potassium hydrogen phthalate (abbreviated as KHP). KHP is an acid with one acidic hydrogen and a molar mass of 204.22 g/mol. In the titration, 58.98 mL of the sodium hydroxide solution was required to react with 0.4000 g KHP. Calculate the molarity of the sodium hydroxide.

The molarity of the sodium hydroxide is 0.0332 M

Explanation:

KHP contains only one hydrogen, one mole of KHC₈H₄O₄ can be titrated with one mole of NaOH.

No. of moles of KHC₈H₄O₄ = mass / molar mass = 0.4000 / 204.22

= 1.96 x 10⁻³ moles

∴ 1.96 x 10⁻³ moles of KPH can titrate 1.96 x 10⁻³ moles of NaOH

conc of NaOH = moles x (1/volume)

                        = 1.96 x 10⁻³ (1/0.05898)

       [NaOH]    = 0.0332 M

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.